Reverts a change in 7fe82070
This project can be added to the classpath of a JUnit runner

 - volatile -> atomic
 - unused code and fields
 - closing streams
 - hashCode / equals
 - known non-null
 - Number.valueOf
 - new String
 Still avoiding SAM, BOB, SusiMail

        to test failure

Findbugs: More findbugs fixes. Including but not limited to: null check fixes and some synchronization

   move cert location to certificates/i2cp.
 * I2PTunnel: Support SSL for connection to local server
   for Standard, HTTP, and IRC server tunnels.
   Put server cert in certificates/i2ptunnel if necessary.

   - Fix LogSettingsTest broken by recent LogManager changes
   - Remove empty LogSettings.java

   by the immutable destination patch

   - Make Destination and RouterIdentity keys and cert immutable
   - Add Destination cache